Clarkia works very well with me. I used 2 small bottles in the first time and one small bottle later on for maintenance cleansing. There are no side effects on me and I am not allegic to any of its herbs so i had few drops the first time, I experienced no side effects then I increased the dosage to 20 drops each time. I did see some stuffs in my stool but I wasn't sure if they were worms or not but anyway, most of the parasites are invisible. I felt good after finishing a course and many symptoms such as cravings, fatigue had disappeared.